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Oil markets were roiled on Monday after Tropical Storm Harvey wreaked havoc along the US Gulf Coast over the weekend, crippling Houston and its port, and knocking out several refineries as well as some crude production.

US gasoline prices hit two-year highs as massive floods caused by the storm forced refineries in the area to close. In turn, US crude futures fell as the refinery shutdowns could reduce demand for American crude.

Brent futures steadied as pipeline blockades in Libya slashed the OPEC state's output by nearly 400,000 barrels per day (bpd).

Harvey is the most powerful hurricane to hit Texas in more than 50 years, killing at least two people, causing large-scale flooding, and forcing the closure of Houston port as well as several refineries.